The Antarctic ice sheets hold a huge reservoir of ice in a dynamic cycle fed by falling snow and drained by glaciers and ice streams. In order to predict future changes to sea level, it is vital to measure the ice sheet volume, to monitor changes in glacier flow and thickness, and to attempt to reconstruct the history of ice sheet behaviour. Radar allows us to do all of these things. This paper explains how, and presents some of the important results in this field.
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